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Robert M Hunger
Noble Research Center, Department of Entomology and Plant Pathology, Oklahoma State University, USA
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Research Article
Pathogenic Fitness of Pyrenophora tritici-repentis Isolates Causing Tan Spot of Winter Wheat in Oklahoma
Author(s): Kazi A Kader, Robert M Hunger* and Mark E Payton
Tan spot of wheat (Triticum aestivum L.) caused by the fungus Pyrenophora tritici-repentis can be a significant disease, and thus developing resistant varieties using fit and virulent isolates is critical to wheat breeding programs. Hence, variability in fitness characters and virulence was determined for P. tritici-repentis isolates collected in three different decades (1980s, 1990s, and 2000s) from Oklahoma wheat fields. Growth (hyphal extension on media), conidia production on media, and conidia production on wheat leaves of a susceptible (TAM 105), an intermediate (Deliver) and a resistant (Red Chief) variety were determined for 17 isolates. Isolates also were evaluated for pseudothecia production and ascospore maturity on wheat straw, and isolate virulence was determined on all three wheat varieties. Isolates differed significantly (p&.. View more»